Membrane switch assembly with improved spacer

Details Membrane switch assembly with improved spacer Membrane switch assembly with improved spacer

1981-02-19

1982-08-17

Truhe, J. V.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, H01H 1304

Patent

active

043451195

ABSTRACT:
A resilient spacer for use in a membrane switch assembly is formed of an open-cell, non-reticulated foam felt layer, allowing air from the space between the upper and lower switch contacts to move into the foam material surrounding the contacts when a switch contact is made. The switch contacts remain protected from atmospheric contamination regardless of whether the assembly is edge sealed or not.

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"Membrane Switches, Low-Cost Companion for Electronic Logic", J. K. Haggerty, Centralab, Inc., Milwaukee, Wisconsin, pp. 90-95, Machine Design, Apr. 10, 1980.
"Membrane Switches Function Reliably in Spite of Dirt, Grease and Spills", J. H. Kelly, W. H. Brady Co., Milwaukee, Wisconsin, pp. 60-62, Control Engineering, Jan. 1980.

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